EP1275871A2 - Brake disc protected from oxidation - Google Patents

Brake disc protected from oxidation Download PDF

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Publication number
EP1275871A2
EP1275871A2 EP20020012288 EP02012288A EP1275871A2 EP 1275871 A2 EP1275871 A2 EP 1275871A2 EP 20020012288 EP20020012288 EP 20020012288 EP 02012288 A EP02012288 A EP 02012288A EP 1275871 A2 EP1275871 A2 EP 1275871A2
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EP
European Patent Office
Prior art keywords
brake disc
lacquer
temperature
paint
resistant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20020012288
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German (de)
French (fr)
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EP1275871A3 (en
EP1275871B1 (en
Inventor
Roland Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Publication date
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Publication of EP1275871A2 publication Critical patent/EP1275871A2/en
Publication of EP1275871A3 publication Critical patent/EP1275871A3/en
Application granted granted Critical
Publication of EP1275871B1 publication Critical patent/EP1275871B1/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/86—Glazes; Cold glazes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/0025—Rust- or corrosion-preventing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F16D65/123—Discs; Drums for disc brakes comprising an annular disc secured to a hub member; Discs characterised by means for mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Compositions of linings; Methods of manufacturing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00362—Friction materials, e.g. used as brake linings, anti-skid materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/1304—Structure
    • F16D2065/1316—Structure radially segmented
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/134—Connection
    • F16D2065/1356—Connection interlocking
    • F16D2065/136—Connection interlocking with relative movement radially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/134—Connection
    • F16D2065/1376—Connection inner circumference
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/134—Connection
    • F16D2065/1392—Connection elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/0034—Materials; Production methods therefor non-metallic
    • F16D2200/0039—Ceramics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/006—Materials; Production methods therefor containing fibres or particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/249928—Fiber embedded in a ceramic, glass, or carbon matrix

Definitions

  • the invention relates to an oxidation-protected brake disc made of fiber-reinforced ceramic, a Use of a lacquer for such a brake disc and a method for producing such Brake disc.
  • DE 44 38 455 C1 shows a method for producing a friction unit, in which a porous carbon body is infiltrated with liquid silicon.
  • the silicon changes with the Carbon to silicon carbide SiC.
  • the carbon body is preferably a carbon fiber body executed. If the friction unit, here a brake disc, is composed of two halves, then you can Before the ceramization, recesses are made in the carbon body, which are separated by the Then assemble the carbon bodies into a common cavity, for example one Cooling channel, complete.
  • DE 198 43 542 A1 also discloses a method for producing bodies, which contain reinforcing fibers.
  • fibers, fiber bundles or Fiber agglomerates used and aligned so that the reinforcing fibers in the area of Recesses in the brake disc are oriented approximately parallel to the side edges of the recesses.
  • These brake discs made of fiber-reinforced ceramic are largely resistant to Environmental factors; only a small amount of wear is detectable during operation.
  • Ceramic Solutions, Inc., Hawthorne USA sells various protective coatings for carbon materials.
  • a primer varnish (designation: CSP-2) is sold, which is made on the basis of phosphates and forms an oxidation protection for carbon surfaces. This lacquer penetrates the surface porosity and in this way reduces the oxidation rate.
  • the primer lacquer serves as a base layer for a top coat, which is also sold by Ceramic Solutions. These top coats can be used for operating temperatures up to 927 ° Celsius or 1149 ° Celsius. These top coats are highly resistant to water, water vapor and salts of the alkali metals. They are ceramic-based and form a barrier that prevents the oxidation of carbon.
  • Ceramic Solutions offers a protective varnish with an operating temperature range of up to 1260 °. This lacquer is extremely resistant to water and water vapor and also resists attacks by salts of the alkali metals. This protective lacquer is a ceramic-based sealing material that offers the oxidation of carbon and other ceramic phases. This protective varnish is recommended for use on ceramic composites containing carbon or other phases susceptible to active oxidation. This protective varnish is recommended as a seal over a primary protective layer (e.g. SiC, Si 3 N 4 , oxides etc.).
  • a primary protective layer e.g. SiC, Si 3 N 4 , oxides etc.
  • the invention lies with it based on the surprising finding that, contrary to previous assumptions, brake discs fiber reinforced ceramic despite the inherently very stable ceramic components of a Oxidation protection is required to counteract even under the operating conditions that occur in vehicles Resistant to oxidation.
  • the brake disc has a layer of high temperature-resistant paint which is viscous at the operating temperature of the brake disc is provided.
  • the high temperature resistance of the paint is required so that the paint in braking operation occurring temperatures of more than 1100 ° Celsius is not destroyed.
  • An essential quality of the paint is that it becomes viscous in the operating temperature range of the brake disc, i.e. that the Glass temperature of the paint is below the operating temperature of the brake disc and thus the Paint is in a tough to soft elastic state until it reaches its melting temperature.
  • This behavior advantageously leads to the fact that a closed lacquer film is always formed and that Access to oxygen from the brake disc is prevented or even prevented. Even damage to the Lacquer layer, e.g. B. by cracking can be healed in this way.
  • the paint is temperature resistant up to at least 1200 ° Celsius and above about 400 ° Celsius becomes viscous.
  • the lacquer has additional color pigments, such as aluminum oxide are added.
  • These pigments should be one of those Base coat have comparable temperature resistance. With such color pigments it is in advantageously possible to visually lift the paint layer from the brake disc and visibly do. For example, brake disks provided with a layer of paint can be particularly useful be marked.
  • the color pigments are thermally unstable and cause a color change Cause a specific limit temperature to be reached.
  • a specific limit temperature By using such color pigments it is also possible to exceed the predetermined by the selection of color pigments Limit temperatures.
  • Such a display can be used to overload the Display brake disc so that, for example, during the next inspection of the vehicle Overload is detected and the brake discs are replaced.
  • the friction surface of the brake disc and the contact surfaces of the brake discs are advantageously closed other components, such as. B. a pot of the brake disc or fasteners of the brake disc, not covered by a layer of varnish.
  • the friction properties of the Brake disc cannot be changed.
  • the contact surfaces of the brake disc Atmospheric oxygen is not freely exposed, so that the risk of oxygen ingress is low here.
  • the object is achieved in that a highly temperature-resistant, Operating temperature viscous paint applied to a brake disc made of fiber-reinforced ceramic becomes.
  • a highly temperature-resistant, at Operating temperature of the brake disc viscous paint on a brake disc made of fiber reinforced Ceramic is applied. If the friction surface and any existing contact surfaces are not covered by paint it should be covered, it is further proposed that these surfaces are covered when painting. According to an alternative development of the invention, it is proposed that these surfaces be used first co-lacquered and machined after painting. This approach has the advantage on the fact that further painting processes, such as. B. dip painting are applicable. It is also through This procedure ensures that paint residues are not, for example, crawled under Cover on friction surfaces or contact surfaces. Mechanical removal of the paint layer can advantageously carried out together with a finishing of the friction surfaces or the contact surfaces.
  • the brake disc shown in Fig. 1 consists of a friction ring 1 and a brake cup 2.
  • the friction ring and the brake pot 2 are connected to one another by fastening elements 3.
  • the fasteners 3 are guided in the brake pot 2 so that different thermal expansions of the brake ring 1 and the brake pot 2 are compensated.
  • the brake ring 1 consists of fiber-reinforced ceramic, more precisely of C-fiber reinforced silicon carbide (C / CSiC).
  • the brake pot 2 as well as the fastening elements 3 including screws 3 'consist of Stainless steel.
  • the brake ring 1 has two friction surfaces 4 on the outside, which are shown in FIG Are in contact.
  • the brake disc shown is usually for a partial lining - disc brake system used, d. H. the friction linings only cover part of the friction surfaces 4.
  • cooling channels 5 are provided within the friction ring extend from an inner circumference 6 in an involute shape to an outer circumference 7. Starting from the Friction surface 5 bores 8 are also provided, which extend into the cooling channels.
  • the brake disc is provided with a lacquer layer 9.
  • the Paint layer 9 covers the outer circumference 7 of the brake disc, the inner circumference 6 of the Brake disc, the cooling channels 5 and the bores 8.
  • the friction surfaces 4 including contact surfaces 10 to brake pot 2, here also contact surfaces 11 to heads of screws 3 ', are not covered with the lacquer layer 9 covered.
  • the lacquer layer 9 has a total thickness of 200 ⁇ m +/- 100 ⁇ m on.
  • the cover layer 13 is then also dried.
  • the lacquer layer 9 becomes viscous during operation of the brake disc and flows into a continuous one Layer that penetrates all unevenness in the surface of the brake ring 2. Possibly in the paint layer 9 cracks that occur are the next time they are heated, i. H. at the next braking operation renewed softening of the lacquer layer 9 is closed again by the running of the lacquer layer.
  • the cover layer 13 can additionally color pigments such. B. be mixed with metal oxides. Have this the purpose of making the paint layer 9 more visible in terms of color. Such coloring is special on the outer circumference 7 of the brake disc, but surprisingly also visible in the bores 8.
  • the paint layer 9 can also be constructed by color pigments in such a way that it functions as a load indicator takes over, i.e. depending on the setting of the color pigments in the lacquer layer 9 can by a Color change the thermal load on the brake disc can be detected.

Abstract

Brake disk protected from oxidation is made of fiber-reinforced ceramic material. One layer made of a high temperature-resistant lacquer (9) is in a semifluid state at the operating temperature of the brake disk. Independent claims are also included for the use of a high temperature-resistant lacquer for a brake disk, and for a process for producing the above brake disk. Preferred Features: The glass transition temperature of the lacquer lies above about 400 degrees C and the lacquer is temperature resistant up to about 1200 degrees C. The lacquer is based on a magnesium/borosilicate compound. The lacquer additionally contains color pigments which change color above a specific temperature. The friction surfaces (4) and the contact surfaces (10,11) of the brake disk are not covered by the lacquer.

Description

Die Erfindung betrifft eine oxidationsgeschützte Bremsscheibe aus faserverstärkter Keramik, eine Verwendung eines Lackes für eine solche Bremsscheibe sowie ein Verfahren zur Herstellung einer solchen Bremsscheibe.The invention relates to an oxidation-protected brake disc made of fiber-reinforced ceramic, a Use of a lacquer for such a brake disc and a method for producing such Brake disc.

Bremsscheiben aus faserverstärkter Keramik sind bereits aus der DE 44 38 455 C1 sowie der DE 198 34 542 A1 bekannt. Die DE 44 38 455 C1 zeigt ein Verfahren zur Herstellung einer Reibeinheit, bei der ein poröser Kohlenstoffkörper mit flüssigem Silizium infiltriert wird. Hierbei wandelt sich das Silizium mit dem Kohlenstoff zu Siliziumkarbid SiC um. Der Kohlenstoffkörper ist vorzugsweise als Kohlenstofffaserkörper ausgeführt. Wird die Reibeinheit, hier eine Bremsscheibe, aus zwei Hälften zusammengesetzt, so können vor der Keramisierung in die Kohlenstoffkörper Ausnehmungen eingebracht werden, die sich durch das Zusammensetzen der Kohlenstoffkörper dann zu einem gemeinsamen Hohlraum, beispielsweise einem Kühlkanal, ergänzen. Die DE 198 43 542 A1 offenbart ebenfalls ein Verfahren zur Herstellung von Körpern, die Verstärkungsfasern enthalten. Im Unterschied zur DE 44 38 455 C1 werden Fasern, Faserbündel oder Faseragglomerate verwendet und so ausgerichtet, dass die Verstärkungsfasern im Bereich der Ausnehmungen in der Bremsscheibe in etwa parallel zu den Seitenkanten der Ausnehmungen orientiert sind. Diese Bremsscheiben aus faserverstärkter Keramik sind weitestgehend beständig gegenüber Umwelteinflüssen; im Betrieb ist nur ein geringer Verschleiß nachweisbar.Brake disks made of fiber-reinforced ceramic are already known from DE 44 38 455 C1 and DE 198 34 542 A1 known. DE 44 38 455 C1 shows a method for producing a friction unit, in which a porous carbon body is infiltrated with liquid silicon. Here, the silicon changes with the Carbon to silicon carbide SiC. The carbon body is preferably a carbon fiber body executed. If the friction unit, here a brake disc, is composed of two halves, then you can Before the ceramization, recesses are made in the carbon body, which are separated by the Then assemble the carbon bodies into a common cavity, for example one Cooling channel, complete. DE 198 43 542 A1 also discloses a method for producing bodies, which contain reinforcing fibers. In contrast to DE 44 38 455 C1, fibers, fiber bundles or Fiber agglomerates used and aligned so that the reinforcing fibers in the area of Recesses in the brake disc are oriented approximately parallel to the side edges of the recesses. These brake discs made of fiber-reinforced ceramic are largely resistant to Environmental factors; only a small amount of wear is detectable during operation.

Die Firma Ceramic Solutions, Inc., Hawthorne USA vertreibt verschiedene Schutzlacke für Karbonwerkstoffe. Vertrieben wird ein Primer-Lack (Bezeichnung: CSP-2), der auf Grundlage von Phosphaten hergestellt ist und einen Oxidationsschutz für Karbon - Oberflächen bildet. Dieser Lack dringt in die Oberflächenporositäten ein und vermindert auf diese Weise die Oxidationsrate. Der Primer - Lack dient als Grundschicht für einen Decklack, der ebenfalls von der Firma Ceramic Solutions vertrieben wird. Diese Decklacke sind für Betriebstemperaturen bis 927° Celsius bzw. 1149° Celsius anwendbar. Diese Decklacke weisen eine hohe Beständigkeit gegenüber Wasser, Wasserdampf und Salzen der Alkalimetalle auf. Sie sind keramikbasiert und bilden eine Barriere, die die Oxidation von Karbon verhindert. Sie werden in Verbindung mit dem beschriebenen Primer - Lack zur Verwendung auf Graphit, Karbon und Karbon/Verbundwerkstoffe angeboten, um Oxidation zu verhindern. Schließlich wird von der Firma Ceramic Solutions ein Schutzlack angeboten, dessen Betriebstemperaturbereich bis 1260° reicht. Dieser Lack ist extrem beständig gegenüber Wasser und Wasserdampf und widersteht ebenfalls Angriffen durch Salze der Alkalimetalle. Bei diesem Schutzlack handelt es sich um einen keramisch basierten Dichtwerkstoff, der die Oxidation von Karbon und anderen keramischen Phasen bietet. Dieser Schutzlack wird für eine Verwendung auf keramischen Verbundwerkstoffen empfohlen, die Karbon oder andere, für eine aktive Oxidation empfängliche Phasen enthalten. Dieser Schutzlack wird als Versiegelung über einer primären Schutzschicht (z. B. SiC, Si3N4, Oxyde etc.) empfohlen. Ceramic Solutions, Inc., Hawthorne USA sells various protective coatings for carbon materials. A primer varnish (designation: CSP-2) is sold, which is made on the basis of phosphates and forms an oxidation protection for carbon surfaces. This lacquer penetrates the surface porosity and in this way reduces the oxidation rate. The primer lacquer serves as a base layer for a top coat, which is also sold by Ceramic Solutions. These top coats can be used for operating temperatures up to 927 ° Celsius or 1149 ° Celsius. These top coats are highly resistant to water, water vapor and salts of the alkali metals. They are ceramic-based and form a barrier that prevents the oxidation of carbon. They are offered in conjunction with the described primer paint for use on graphite, carbon and carbon / composite materials to prevent oxidation. Finally, Ceramic Solutions offers a protective varnish with an operating temperature range of up to 1260 °. This lacquer is extremely resistant to water and water vapor and also resists attacks by salts of the alkali metals. This protective lacquer is a ceramic-based sealing material that offers the oxidation of carbon and other ceramic phases. This protective varnish is recommended for use on ceramic composites containing carbon or other phases susceptible to active oxidation. This protective varnish is recommended as a seal over a primary protective layer (e.g. SiC, Si 3 N 4 , oxides etc.).

Es ist Aufgabe der Erfindung, Schädigungen der Bremsscheibe zu vermindern und möglichst ganz zu vermeiden.It is an object of the invention to reduce damage to the brake disc and as far as possible avoid.

Diese Aufgabe wird mit den Merkmalen der unabhängigen Patentansprüche gelöst. Der Erfindung liegt dabei die überraschende Erkenntnis zugrunde, dass entgegen bisheriger Annahmen Bremsscheiben aus faserverstärkter Keramik trotz der an und für sich sehr beständigen Keramik - Bestandteile eines Oxidationsschutzes bedürfen, um auch unter Betriebsbedingungen, wie sie bei Fahrzeugen auftreten, gegen Oxidation beständig zu sein.This object is achieved with the features of the independent claims. The invention lies with it based on the surprising finding that, contrary to previous assumptions, brake discs fiber reinforced ceramic despite the inherently very stable ceramic components of a Oxidation protection is required to counteract even under the operating conditions that occur in vehicles Resistant to oxidation.

Vorrichtungsgemäß wird vorgeschlagen, dass die Bremsscheibe mit einer Schicht aus einem hoch temperaturbeständigen, bei Betriebstemperatur der Bremsscheibe zähflüssigem Lack vorgesehen ist. Die hohe Temperaturbeständigkeit des Lackes ist erforderlich, damit der Lack bei den im Bremsbetrieb auftretenden Temperaturen von mehr als 1100° Celsius nicht zerstört wird. Eine wesentliche Eigenschaft des Lackes aber ist, dass er im Betriebstemperaturbereich der Bremsscheibe zähflüssig wird, d.h. dass die Glastemperatur des Lackes unterhalb der Betriebstemperatur der Bremsscheibe liegt und sich somit der Lack bis zum Erreichen seiner Schmelztemperatur in einem zäh- bis weicheleastischen Zustand befindet. Dieses Verhalten führt in vorteilhafter Weise dazu, dass sich stets ein geschlossener Lackfilm bildet und der Zutritt von Sauerstoff zur Bremsscheibe verhindert oder sogar unterbunden wird. Auch Beschädigungen der Lackschicht, z. B. durch Rissbildung, können auf diese Weise geheilt werden. Es ist vorzugsweise vorgesehen, dass der Lack bis wenigstens 1200° Celsius temperaturbeständig ist und oberhalb von etwa 400° Celsius zähflüssig wird.It is proposed according to the device that the brake disc has a layer of high temperature-resistant paint which is viscous at the operating temperature of the brake disc is provided. The high temperature resistance of the paint is required so that the paint in braking operation occurring temperatures of more than 1100 ° Celsius is not destroyed. An essential quality of the paint is that it becomes viscous in the operating temperature range of the brake disc, i.e. that the Glass temperature of the paint is below the operating temperature of the brake disc and thus the Paint is in a tough to soft elastic state until it reaches its melting temperature. This behavior advantageously leads to the fact that a closed lacquer film is always formed and that Access to oxygen from the brake disc is prevented or even prevented. Even damage to the Lacquer layer, e.g. B. by cracking can be healed in this way. It is preferable provided that the paint is temperature resistant up to at least 1200 ° Celsius and above about 400 ° Celsius becomes viscous.

Gemäß einer Weiterbildung der Erfindung kann es vorgesehen sein, dass dem Lack zusätzliche, farbgebende Pigmente, wie beispielsweise Aluminiumoxid beigefügt sind. Diese Pigmente sollten eine dem Grundlack vergleichbare Temperaturbeständigkeit aufweisen. Mit derartigen Farbpigmenten ist es in vorteilhafter Weise möglich, die Lackschicht optisch von der Bremsscheibe abzuheben und sichtbar zu machen. Beispielsweise können damit mit einer Lackschicht versehene Bremsscheiben besonders gekennzeichnet werden.According to a development of the invention, it can be provided that the lacquer has additional color pigments, such as aluminum oxide are added. These pigments should be one of those Base coat have comparable temperature resistance. With such color pigments it is in advantageously possible to visually lift the paint layer from the brake disc and visibly do. For example, brake disks provided with a layer of paint can be particularly useful be marked.

Besonders vorteilhaft ist es, wenn die Farbpigmente thermisch instabil sind und einen Farbumschlag bei Erreichen einer spezifischen Grenztemperatur hervorrufen. Durch die Verwendung derartiger Farbpigmente ist es zusätzlich möglich, die Überschreitung von durch die Auswahl der Farbpigmente vorgegebenen Grenztemperaturen anzuzeigen. Eine solche Anzeige kann verwendet werden, um Überlastung der Bremsscheibe anzuzeigen, so dass beispielsweise bei der nächsten Inspektion des Fahrzeuges diese Überlastung erkannt und ein Austausch der Bremsscheiben veranlasst wird. It is particularly advantageous if the color pigments are thermally unstable and cause a color change Cause a specific limit temperature to be reached. By using such color pigments it is also possible to exceed the predetermined by the selection of color pigments Limit temperatures. Such a display can be used to overload the Display brake disc so that, for example, during the next inspection of the vehicle Overload is detected and the brake discs are replaced.

Vorteilhafter Weise sind die Reibfläche der Bremsscheibe sowie die Kontaktflächen der Bremsscheiben zu anderen Bauteilen, wie z. B. einem Topf der Bremsscheibe oder Befestigungselementen der Bremsscheibe, nicht von einer Lackschicht bedeckt. Zum Einen dürfen durch die Lackschicht die Reibeigenschaften der Bremsscheibe nicht verändert werden. Zum Anderen sind Kontaktflächen der Bremsscheibe dem Luftsauerstoff nicht frei ausgesetzt, so dass hier die Gefahr eines Sauerstoffeintrittes gering ist.The friction surface of the brake disc and the contact surfaces of the brake discs are advantageously closed other components, such as. B. a pot of the brake disc or fasteners of the brake disc, not covered by a layer of varnish. On the one hand, the friction properties of the Brake disc cannot be changed. On the other hand, the contact surfaces of the brake disc Atmospheric oxygen is not freely exposed, so that the risk of oxygen ingress is low here.

Verwendungsgemäß wird die Aufgabe dadurch gelöst, dass ein hoch temperaturbeständiger, bei Betriebstemperatur zähflüssiger Lack auf eine Bremsscheibe aus faserverstärkter Keramik aufgebracht wird.According to the use, the object is achieved in that a highly temperature-resistant, Operating temperature viscous paint applied to a brake disc made of fiber-reinforced ceramic becomes.

Verfahrensgemäß ist es ergänzend vorgesehen, dass ein hoch temperaturbeständiger, bei Betriebstemperatur der Bremsscheibe zähflüssiger Lack auf eine Bremsscheibe aus faserverstärkter Keramik aufgebracht wird. Wenn die Reibfläche sowie ggf. vorhandene Kontaktflächen nicht von Lack bedeckt sein sollen, wird weiterhin vorgeschlagen, dass diese Flächen beim Lackieren abgedeckt sind. Gemäß einer alternativen Weiterbildung der Erfindung wird vorgeschlagen, diese Flächen zunächst mitzulackieren und nach dem Lackieren mechanisch zu bearbeiten. Diese Vorgehensweise weist den Vorteil auf, dass hier weitere Lackierverfahren, wie z. B. das Tauchlackieren, anwendbar sind. Außerdem ist durch dieses Verfahren sicher gestellt, dass nicht doch Lackreste beispielsweise durch Unterkriechen einer Abdeckung auf Reibflächen oder Kontaktflächen gelangen. Das mechanische Abtragen der Lackschicht kann vorteilhafter Weise zusammen mit einer Endbearbeitung der Reibflächen oder der Kontaktflächen erfolgen.According to the method, it is additionally provided that a highly temperature-resistant, at Operating temperature of the brake disc viscous paint on a brake disc made of fiber reinforced Ceramic is applied. If the friction surface and any existing contact surfaces are not covered by paint it should be covered, it is further proposed that these surfaces are covered when painting. According to an alternative development of the invention, it is proposed that these surfaces be used first co-lacquered and machined after painting. This approach has the advantage on the fact that further painting processes, such as. B. dip painting are applicable. It is also through This procedure ensures that paint residues are not, for example, crawled under Cover on friction surfaces or contact surfaces. Mechanical removal of the paint layer can advantageously carried out together with a finishing of the friction surfaces or the contact surfaces.

Die Erfindung ist nachstehend anhand eines Ausführungsbeispieles näher erläutert.The invention is explained in more detail below using an exemplary embodiment.

Es zeigen:

Fig. 1
eine Bremsscheibe aus faserverstärkter Keramik,
Fig. 2
eine seitliche Detailansicht der Bremsscheibe,
Fig. 3
eine Detailansicht des inneren Umfanges der Bremsscheibe und
Fig. 4
eine Detailansicht der Reibfläche mit Bohrungen.
Show it:
Fig. 1
a brake disc made of fiber-reinforced ceramic,
Fig. 2
a detailed side view of the brake disc,
Fig. 3
a detailed view of the inner circumference of the brake disc and
Fig. 4
a detailed view of the friction surface with holes.

Die in Fig. 1 gezeigte Bremsscheibe besteht aus einem Reibring 1 und einem Bremstopf 2. Der Reibring und der Bremstopf 2 sind durch Befestigungselemente 3 miteinander verbunden. Die Befestigungselemente 3 sind im Bremstopf 2 so geführt, dass unterschiedliche thermische Dehnungen des Bremsringes 1 und des Bremstopfes 2 ausgeglichen werden.The brake disc shown in Fig. 1 consists of a friction ring 1 and a brake cup 2. The friction ring and the brake pot 2 are connected to one another by fastening elements 3. The fasteners 3 are guided in the brake pot 2 so that different thermal expansions of the brake ring 1 and the brake pot 2 are compensated.

Der Bremsring 1 besteht aus faserverstärkter Keramik, genauer aus C - Faser verstärktem Siliziumcarbid (C/CSiC). Der Bremstopf 2 wie auch die Befestigungselemente 3 samt Schrauben 3' bestehen aus Edelstahl. The brake ring 1 consists of fiber-reinforced ceramic, more precisely of C-fiber reinforced silicon carbide (C / CSiC). The brake pot 2 as well as the fastening elements 3 including screws 3 'consist of Stainless steel.

Der Bremsring 1 weist außenseits zwei Reibflächen 4 auf, die mit hier nicht gezeigten Reibbelägen in Kontakt stehen. Üblicherweise ist die dargestellt Bremsscheibe für eine Teilbelag - Scheibenbremsanlage verwendet, d. h. die Reibbeläge überdecken jeweils nur einen Teil der Reibflächen 4.The brake ring 1 has two friction surfaces 4 on the outside, which are shown in FIG Are in contact. The brake disc shown is usually for a partial lining - disc brake system used, d. H. the friction linings only cover part of the friction surfaces 4.

Zur besseren Kühlung der Bremsscheibe sind innerhalb des Reibringes 1 Kühlkanäle 5 vorgesehen, die sich von einem inneren Umfang 6 evolventenförmig zu einem äußeren Umfang 7 erstrecken. Ausgehend von der Reibfläche 5 sind ferner Bohrungen 8 vorgesehen, die sich bis in die Kühlkanäle erstrecken.For better cooling of the brake disc 1 cooling channels 5 are provided within the friction ring extend from an inner circumference 6 in an involute shape to an outer circumference 7. Starting from the Friction surface 5 bores 8 are also provided, which extend into the cooling channels.

Zum Schutz gegen Sauerstoffzutritt ist die Bremsscheibe mit einer Lackschicht 9 versehen. Die Lackschicht 9 überdeckt den äußeren Umfang 7 der Bremsscheibe, den inneren Umfang 6 der Bremsscheibe, die Kühlkanäle 5 sowie die Bohrungen 8. Die Reibflächen 4 einschließlich Kontaktflächen 10 zum Bremstopf 2, hier auch Kontaktflächen 11 zu Köpfen der schrauben 3', sind nicht mit der Lackschicht 9 bedeckt. Im vorliegenden Beispiel weist die Lackschicht 9 eine Gesamtstärke von 200 µm +/- 100 µm auf.To protect against the entry of oxygen, the brake disc is provided with a lacquer layer 9. The Paint layer 9 covers the outer circumference 7 of the brake disc, the inner circumference 6 of the Brake disc, the cooling channels 5 and the bores 8. The friction surfaces 4 including contact surfaces 10 to brake pot 2, here also contact surfaces 11 to heads of screws 3 ', are not covered with the lacquer layer 9 covered. In the present example, the lacquer layer 9 has a total thickness of 200 μm +/- 100 μm on.

Zum Aufbringen der Lackschicht 9 werden zunächst die Reibflächen 4 sowie die Kontaktflächen 10, 11mit entsprechend zugeschnittenen, hier nicht gezeigten selbstklebenden Folien abgedeckt. Anschließend wird die Bremsscheibe in einem ersten Arbeitsgang mit einer Primer - Schicht 12 (Lack mit der Bezeichnung "CSP-2" der Fa. Ceramic Solutions, Inc., USA) versehen, die folgende Zusammensetzung aufweist:

  • Anorganische Phospat:   2 bis 15 %
  • Essigsäure:   15 bis 30 %
  • Armodiumnitrat:   8 bis 20 %
  • Wasser:   40 bis 70 %
To apply the lacquer layer 9, the friction surfaces 4 and the contact surfaces 10, 11 are first covered with appropriately cut self-adhesive films, not shown here. In a first step, the brake disc is then provided with a primer layer 12 (lacquer with the designation "CSP-2" from Ceramic Solutions, Inc., USA), which has the following composition:
  • Inorganic phosphate: 2 to 15%
  • Acetic acid: 15 to 30%
  • Armodium nitrate: 8 to 20%
  • Water: 40 to 70%

Nach dem Auftragen wird die Primerschicht 12, beispielsweise in einem Ofen, getrocknet. Anschließend wird eine Deckschicht 13 (Lack mit der Bezeichnung "CSD1550D" der Fa. Ceramoc Solutions, Inc., USA) mit folgender Zusammensetzung aufgebracht:

  • Metalloxyde:   50 bis 70 %
  • Organische Lösungsmittel:   20 bis 45 %
  • Siliconharz:   5 bis 15 %
After application, the primer layer 12 is dried, for example in an oven. A cover layer 13 (lacquer with the designation "CSD1550D" from Ceramoc Solutions, Inc., USA) is then applied with the following composition:
  • Metal oxides: 50 to 70%
  • Organic solvents: 20 to 45%
  • Silicone resin: 5 to 15%

Auch die Deckschicht 13 wird anschließend getrocknet.The cover layer 13 is then also dried.

Die Lackschicht 9 wird beim Betrieb der Bremsscheibe zähflüssig und zerfließt zu einer durchgehenden Schicht, die in alle Unebenheiten der Oberfläche des Bremsringes 2 eindringt. Eventuell in der Lackschicht 9 auftretende Risse werden bei der nächsten Erwärmung, d. h. beim nächsten Bremsbetrieb, durch erneutes Aufweichen der Lackschicht 9 durch das Verlaufen der Lackschicht wieder geschlossen.The lacquer layer 9 becomes viscous during operation of the brake disc and flows into a continuous one Layer that penetrates all unevenness in the surface of the brake ring 2. Possibly in the paint layer 9 cracks that occur are the next time they are heated, i. H. at the next braking operation renewed softening of the lacquer layer 9 is closed again by the running of the lacquer layer.

Der Deckschicht 13 können zusätzlich Farbpigmente wie z. B. Metalloxide beigemischt sein. Diese haben den Zweck, die Lackschicht 9 farblich besser sichtbar zu gestalten. Ein solche Einfärbung ist insbesondere am äußeren Umfang 7 der Bremsscheibe, überraschenderweise aber auch in den Bohrungen 8 sichtbar.The cover layer 13 can additionally color pigments such. B. be mixed with metal oxides. Have this the purpose of making the paint layer 9 more visible in terms of color. Such coloring is special on the outer circumference 7 of the brake disc, but surprisingly also visible in the bores 8.

Die Lackschicht 9 kann durch Farbpigmente auch so aufgebaut sein, dass sie die Funktion einer Belastungs-Anzeige übernimmt, d.h. je nach Einstellung der Farbpigmente in der Lackschicht 9 kann durch einen Farbumschlag die thermische Belastung der Bremsscheibe erkannt werden.The paint layer 9 can also be constructed by color pigments in such a way that it functions as a load indicator takes over, i.e. depending on the setting of the color pigments in the lacquer layer 9 can by a Color change the thermal load on the brake disc can be detected.

Claims (20)

Oxydationsgeschützte Bremsscheibe aus faserverstärkter Keramik, dadurch gekennzeichnet, dass eine Schicht aus einem hochtemperaturbeständigen Lack vorgesehen ist, der sich bei Betriebstemperatur der Bremsscheibe im zähflüssigen Zusatnd befindet.Oxidation-protected brake disc made of fiber-reinforced ceramic, characterized in that a layer of a high-temperature-resistant lacquer is provided, which is in the viscous state at the operating temperature of the brake disc. Bremsscheibe nach Anspruch 1, dadurch gekennzeichnet, dass die Glastemeperatur des Lackes oberhalb von etwa 400 °C liegt und der Lack bis etwa 1200 °C temperaturbeständig ist.Brake disc according to claim 1, characterized in that the glass temperature of the paint is above about 400 ° C and the paint is temperature resistant up to about 1200 ° C. Bremsscheibe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Lack auf einer Magnesium-Borsilikat-Verbindung basiert.Brake disc according to claim 1 or 2, characterized in that the paint is based on a magnesium borosilicate compound. Bremsscheibe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass dem Lack zusätzliche, farbgebende Pigmente beigefügt sind.Brake disc according to one of claims 1 to 3, characterized in that additional, coloring pigments are added to the paint. Bremsscheibe nach Anspruch 4, dadurch gekennzeichnet, dass die farbgebenden Pigmente ihre Farbe bei Überschreiten einer spezifischen Grenztemperatur verändern.Brake disc according to claim 4, characterized in that the coloring pigments change their color when a specific limit temperature is exceeded. Bremsscheibe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Reibfläche und Kontaktflächen der Bremsscheibe nicht von dem Lack bedeckt sind.Brake disc according to one of the preceding claims, characterized in that the friction surface and contact surfaces of the brake disc are not covered by the paint. Verwendung eines einem hochtemperaturbeständigen, bei Betriebstemperatur der Bremsscheibe zähflüssigem Lackes für eine Bremsscheibe aus faserverstärkter Keramik.Use of a high temperature resistant, at operating temperature of the brake disc viscous paint for a brake disc made of fiber-reinforced ceramic. Verwendung nach Anspruch 7, dadurch gekennzeichnet, dass die Glastemeperatur des Lackes oberhalb von etwa 400 °C liegt und der Lack bis etwa 1200 °C temperaturbeständig ist.Use according to claim 7, characterized in that the glass temperature of the lacquer is above approximately 400 ° C and the lacquer is temperature-resistant up to approximately 1200 ° C. Verwendung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass der Lack auf einer Magnesium-Borsilikat-Verbindung basiert.Use according to claim 7 or 8, characterized in that the lacquer is based on a magnesium borosilicate compound. Verwendung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die Reibfläche und Kontaktflächen der Bremsscheibe nicht von dem Lack bedeckt sind.Use according to one of claims 7 to 9, characterized in that the friction surface and contact surfaces of the brake disc are not covered by the paint. Verwendung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass dem Lack zusätzliche, farbgebende Pigmente beigefügt sind. Use according to one of Claims 7 to 10, characterized in that additional, color-imparting pigments are added to the lacquer. Verwendung nach Anspruch 11, dadurch gekennzeichnet, dass die farbgebenden Pigmente ihre Farbe bei Überschreiten einer spezifischen Grenztemperatur verändern.Use according to claim 11, characterized in that the coloring pigments change their color when a specific limit temperature is exceeded. Verfahren zur Herstellung einer oxydationsgeschützten Bremsscheibe aus faserverstärkter Keramik, dadurch gekennzeichnet, dass die Bremsscheibe mit einem hochtemperaturbeständigen, bei Betriebstemperatur der Bremsscheibe zähflüssigem Lack beschichtet wird.Method for producing an oxidation-protected brake disk made of fiber-reinforced ceramic, characterized in that the brake disk is coated with a high-temperature-resistant paint which is viscous at the operating temperature of the brake disk. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass die Glastemeperatur des Lackes oberhalb von etwa 400 °C liegt und der Lack bis etwa 1200 °C temperaturbeständig ist.A method according to claim 13, characterized in that the glass temperature of the paint is above about 400 ° C and the paint is temperature resistant up to about 1200 ° C. Verfahren nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass der Lack auf einer Magnesium-Borsilikat-Verbindung basiert.A method according to claim 13 or 14, characterized in that the lacquer is based on a magnesium borosilicate compound. Verfahren nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, dass dem Lack zusätzliche, farbgebende Pigmente beigefügt sind.Method according to one of claims 13 to 15, characterized in that additional, coloring pigments are added to the lacquer. Verfahren nach Anspruch 16, dadurch gekennzeichnet, dass die farbgebenden Pigmente ihre Farbe bei Überschreiten einer spezifischen Grenztemperatur verändern.A method according to claim 16, characterized in that the coloring pigments change their color when a specific limit temperature is exceeded. Verfahren nach einem der Ansprüche 13 bis 17, dadurch gekennzeichnet, dass die Reibfläche und Kontaktflächen der Bremsscheibe nicht von dem Lack bedeckt sind.Method according to one of claims 13 to 17, characterized in that the friction surface and contact surfaces of the brake disc are not covered by the paint. Verfahren nach Anspruch 18, dadurch gekennzeichnet, dass die Reibfläche und Kontaktflächen der Bremsscheibe beim Lackieren abgedeckt sind.A method according to claim 18, characterized in that the friction surface and contact surfaces of the brake disc are covered during painting. Verfahren nach Anspruch 18, dadurch gekennzeichnet, dass die Reibfläche und Kontaktflächen der Bremsscheibe nach dem Lackieren mechanisch bearbeitet werden.A method according to claim 18, characterized in that the friction surface and contact surfaces of the brake disc are machined after painting.
EP20020012288 2001-07-13 2002-06-05 Brake disc protected from oxidation Expired - Lifetime EP1275871B1 (en)

Applications Claiming Priority (2)

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DE2001134059 DE10134059C1 (en) 2001-07-13 2001-07-13 Oxidation-protected brake disc
DE10134059 2001-07-13

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AT (1) ATE304668T1 (en)
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US20030021975A1 (en) 2003-01-30
ATE304668T1 (en) 2005-09-15
EP1275871A3 (en) 2003-02-12
DE50204227D1 (en) 2005-10-20
DE10134059C1 (en) 2003-04-03
ES2244699T3 (en) 2005-12-16
US6805909B2 (en) 2004-10-19
EP1275871B1 (en) 2005-09-14

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